Are 80-Hour Weeks Really That Common?

Nearly everyone in r/accounting says that Big4 means working 80-hour weeks during busy season. However when I came on here, I've heard people say that it's more like 55-60 hours and that it just feels like 80 hours. Then, there's also people on this same sub saying that they do in fact work 80-hour weeks and will log off at like 12-1AM.

Who is right then?

Are 80-hour weeks really that common? Or is this more dependent on the firm/location if anything? Are 80-hour weeks standard throughout the Big4 world? Or what would you say are the standard number of hours for Big4 in general? Is this just a stereotype or is it genuinely that common?

Thank you in advance!